TiO2 nanotubes were prepared under normal pressure at a temperature of 120 ℃. Ag, Au, Pt nanoparticles supported on TiO2 nanotubes were prepared by m icrowave assisted heating polyol process. TEM images showed that m...TiO2 nanotubes were prepared under normal pressure at a temperature of 120 ℃. Ag, Au, Pt nanoparticles supported on TiO2 nanotubes were prepared by m icrowave assisted heating polyol process. TEM images showed that microwave prepa red Ag, Au, Pt nanoparticles supported on TiO2 nanotubes were small and well dis persed on the surface of the TiO2 nanotubes. UV-Vis absorption spectra showed th at the absorbance of Ag/TiO2 nanotubes and Au/TiO2 nanotubes in the visible ligh t range increased greatly compared to the single titania nanotubes.展开更多
Using Fe doped titania powders as the precursor, Fe doped TiO2 nanotubes with small diameter of 10nm were obtained by hydrothermal method. The doped titania powders have two different crystalline phases, anatase and r...Using Fe doped titania powders as the precursor, Fe doped TiO2 nanotubes with small diameter of 10nm were obtained by hydrothermal method. The doped titania powders have two different crystalline phases, anatase and rutile of which the average particle diameters are 30.3nm and 41.7nm, receptively. The products were characterized by TEM, XRD and EDS. The results showed that Fe doped TiO2 nanotubes of 200nm in length could be obtained from Fe doped rutile powder, and have higher yields. The formation mechanism of long titania nanotubes was suggested in the light of the relative stability of crystalline phase.展开更多
提出了一种在水树缺陷内生成纳米级TiO2颗粒的修复液及修复方法,并针对该修复液的修复机制及绝缘增强机制进行了讨论。采用水针法在交联聚乙烯(XLPE)电缆样品中制造水树缺陷,并对已生成水树的样品进行了基于钛酸酯类催化的硅氧烷修复液...提出了一种在水树缺陷内生成纳米级TiO2颗粒的修复液及修复方法,并针对该修复液的修复机制及绝缘增强机制进行了讨论。采用水针法在交联聚乙烯(XLPE)电缆样品中制造水树缺陷,并对已生成水树的样品进行了基于钛酸酯类催化的硅氧烷修复液注入式修复,发现其绝缘性能得到显著提高,甚至击穿电压指标明显优于新电缆。基于扫描电子显微镜(scanning electron microscope,SEM)、X射线光电子能谱分析(X-ray photoelectron spectroscopy,XPS)和红外光谱分析,证明被修复样品击穿通道内有纳米级TiO2颗粒存在。通过对钛酸酯类催化剂水解反应的生成物研究,证明了该催化剂水解后生成纳米级TiO2颗粒。基于这一发现,提出了相应的绝缘增强机制及作用模型,认为分散的纳米级TiO2颗粒有效抑制了通道内由于局部放电产生的烧蚀损伤,从而增强了电缆的绝缘性能,提高了电缆的击穿电压。展开更多
文摘TiO2 nanotubes were prepared under normal pressure at a temperature of 120 ℃. Ag, Au, Pt nanoparticles supported on TiO2 nanotubes were prepared by m icrowave assisted heating polyol process. TEM images showed that microwave prepa red Ag, Au, Pt nanoparticles supported on TiO2 nanotubes were small and well dis persed on the surface of the TiO2 nanotubes. UV-Vis absorption spectra showed th at the absorbance of Ag/TiO2 nanotubes and Au/TiO2 nanotubes in the visible ligh t range increased greatly compared to the single titania nanotubes.
文摘Using Fe doped titania powders as the precursor, Fe doped TiO2 nanotubes with small diameter of 10nm were obtained by hydrothermal method. The doped titania powders have two different crystalline phases, anatase and rutile of which the average particle diameters are 30.3nm and 41.7nm, receptively. The products were characterized by TEM, XRD and EDS. The results showed that Fe doped TiO2 nanotubes of 200nm in length could be obtained from Fe doped rutile powder, and have higher yields. The formation mechanism of long titania nanotubes was suggested in the light of the relative stability of crystalline phase.
文摘提出了一种在水树缺陷内生成纳米级TiO2颗粒的修复液及修复方法,并针对该修复液的修复机制及绝缘增强机制进行了讨论。采用水针法在交联聚乙烯(XLPE)电缆样品中制造水树缺陷,并对已生成水树的样品进行了基于钛酸酯类催化的硅氧烷修复液注入式修复,发现其绝缘性能得到显著提高,甚至击穿电压指标明显优于新电缆。基于扫描电子显微镜(scanning electron microscope,SEM)、X射线光电子能谱分析(X-ray photoelectron spectroscopy,XPS)和红外光谱分析,证明被修复样品击穿通道内有纳米级TiO2颗粒存在。通过对钛酸酯类催化剂水解反应的生成物研究,证明了该催化剂水解后生成纳米级TiO2颗粒。基于这一发现,提出了相应的绝缘增强机制及作用模型,认为分散的纳米级TiO2颗粒有效抑制了通道内由于局部放电产生的烧蚀损伤,从而增强了电缆的绝缘性能,提高了电缆的击穿电压。
